I give blood regularly. And for those that never have there is a long list of questions you have to answer every time you go. Part of that list (maybe 20 or so questions) deals in one way or another about having had sex recently (obviously screening for AIDS/STDs).
So every time I get to that part I just say my wife is in Manila and I haven't had any since (insert last visit here). But of course they won't accept that and will ask every single question (to which I have to go "no, no, no, no, no...").
Next time I go is mid-June. If all goes well and my wife gets here, I will be able to answer with
http://www.youtube.com/watch?v=lQlIhraqL7o!!!
;D ;D ;D
;D ;D ;D